diff --git a/README.md b/README.md
index 8c975ba..b00ade9 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ The command-line interface is straightforward as reflected in the output from
       -l, --log                        Enable log to file
           --log-filename <filename>    Set log filename
       -m, --map <flags>                Map special characters
-      -c, --color <0..255>             Colorize tio text
+      -c, --color <code>               Colorize tio text
       -S, --socket <socket>            Listen on socket
       -v, --version                    Display version
       -h, --help                       Display help